/**
 * Tencent is pleased to support the open source community by making Tars available.
 *
 * Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

package com.qq.tars.register.eureka;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.netflix.appinfo.ApplicationInfoManager.StatusChangeListener;
import com.netflix.discovery.StatusChangeEvent;

public class TarsStatusChangeListener implements StatusChangeListener {

    private static final AtomicInteger ID_GENERATOR = new AtomicInteger(0);

    private static final String PREFIX = "statusListener";

    private static final Log log = LogFactory.getLog(TarsStatusChangeListener.class);

    @Override
    public String getId() {
        int index = ID_GENERATOR.getAndIncrement();
        return PREFIX + index;
    }

    @Override
    public void notify(StatusChangeEvent statusChangeEvent) {
        log.info("service status change from " + statusChangeEvent.getPreviousStatus().toString() + " to " + statusChangeEvent.getStatus().toString());
    }

}
